JP4093665B2 - Coordinate detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention irradiates light substantially parallel to the writing surface of the whiteboard or the display surface of the display device to form a touch panel surface, and detects the position where the light forming the touch panel surface is shielded. More specifically, the present invention relates to a coordinate detection device that detects a coordinate position on a surface or a display surface, and more specifically, misrecognition of a shielding position caused by the presence of dust, dust, and dust on a reflecting member that reflects light from a light source. The present invention relates to a coordinate detection device that can be prevented.
[0002]
[Prior art]
As a conventional coordinate detection device, for example, two light source units that irradiate light parallel to the display surface of the display device while rotating, a reflection unit that retroreflects light from the light source unit in the incident direction, and a light source unit There are some provided with a detection unit provided at each position and receiving reflected light from the reflection unit.
[0003]
The two light source parts change the direction and irradiate light to the reflection part in parallel with the display surface of the display device. The reflection part retroreflects this light to the light source part and is provided at the position of the light source part. The detection unit receives light retroreflected from the reflection unit. When light is blocked by a finger or a pen, the detection unit detects the direction of the light source unit. From the distance between the two light source units and the detected orientation of the two light source units, the coordinates of the position indicated by the finger or the pen can be calculated.
[0004]
FIG. 16 is a schematic configuration diagram of an example of a conventional coordinate detection apparatus. The conventional coordinate detection device shown in FIG. 16 is rotating with a display device 1601 having a rectangular display surface serving as a coordinate input area, and reflecting members 1602A, 1602B and 1602C that retroreflect incident light to a light source. Light scanners 1603A and 1603B that irradiate light and receive reflected light from the reflecting member, a calculation unit 1604 that calculates coordinates indicated by a pen 1607 that inputs coordinates, and the coordinates of the pen 1607 that are calculated by the calculation unit 1604 An interface unit 1605 for outputting to 1606 and the like.
[0005]
The reflective members 1602A, 1602B, and 1602C are configured by, for example, a corner cube array or a retroreflective tape in which a large number of corner cube reflectors are arranged, and the reflective surface has a rectangular shape. The reflecting members 1602A, 1602B, and 1602C are provided on the left and right sides and the lower portion of the display device 1601, respectively, so that the reflecting surfaces thereof are perpendicular to the display surface of the display device 1601.
[0006]
The light scanners 1603A and 1603B are provided at positions on both ends of the upper part of the display device 1601, respectively, irradiate light to the reflecting members 1602A, 1602B, and 1602C while changing their directions, and reflect from the reflecting members 1602A, 1602B, and 1602C. Receives light. When the light is blocked by the pen 1607, the light scanners 1603A and 1603B detect that the light is blocked, and detect θ3 and θ4 corresponding to the directions of the light scanners 1603A and 1603B at that time.
[0007]
The calculation unit 1604 acquires the values of θ1 and θ2 from the light scanners 1603A and 1603B, and coordinates (indicated by the pen 1607) from the distance W2 between the light scanners that are measured and input in advance and the acquired θ1 and θ2. X2, Y2) is calculated, and the coordinates (X2, Y2) are notified to the personal computer or the like via the interface unit 1605.
[0008]
In the coordinate detection apparatus provided with such a reflecting member, if there is dust, dust or dust (hereinafter sometimes referred to as dust) on the reflecting surface of the reflecting member, the light is blocked by the dust, dust or the like. Since the light does not reach the reflecting surface, and therefore no reflection is performed, a malfunction occurs in which it is determined that the instruction is given even though it is not indicated by the pen.
[0009]
In particular, in a coordinate detection device having a light scanner at both ends of the upper part of the display device and reflecting members at the left and right and the lower part, the reflection of the reflecting member disposed at the lower part of the display device and opposite to the direction of gravity. Garbage etc. tend to accumulate on the surface. Furthermore, when a whiteboard is used instead of the display device and writing is performed on the writing surface of the whiteboard with the marker pen, the marker pen is erased, but the light falls on the reflecting surface of the reflecting member arranged at the lower part of the whiteboard. There is a high possibility of causing malfunctions.
[0010]
For this reason, when the user notices a malfunction or notices that dust or the like has accumulated on the reflecting surface of the reflecting member, the user cleans the reflecting surface of the reflecting member such as a cloth to remove dust or the like. Is removed and no longer malfunctions.
[0011]
[Problems to be solved by the invention]
However, according to the above conventional technique, when dust is collected on the reflecting surface of the reflecting member, the dust is collected on the reflecting surface of the reflecting member disposed under the whiteboard or the display device, although cleaning is performed as appropriate. The collected dust can cause malfunctions, and in order to accurately detect coordinates, the work must be interrupted frequently to clean the reflective surface, or the user can be cleaned. There was a problem that the burden of was heavy.
[0012]
In addition, since the reflecting surface of the reflecting member is fixed to the whiteboard, it is difficult to clean. In particular, the corner portions of the reflecting members on the two sides are liable to collect dust and the like. there were.
[0013]
Furthermore, the corner portions of the reflecting members on the two sides have the problem that the light incident angle from the light source means becomes the smallest, so that the reflection performance of the light from the light source means decreases at the corner portions. Further, when there is a variation in joining of the two reflecting members in the corner portion, there is a further problem that the reflection performance of the corner portion is deteriorated.
[0014]
The present invention has been made in view of the above, and makes it difficult to collect dust, dust, or dust on the reflecting surface of the reflecting member, thereby reducing the frequency of malfunctions, interruption of work, and the burden of cleaning by the user. For the purpose.
[0015]
Moreover, this invention is made | formed in view of the above, Comprising: It aims at making it easy to clean the reflective surface of a reflective member.
[0016]
In addition, the present invention has been made in view of the above, and an object thereof is to improve the light reflection performance at the corner portions of the reflecting members on the two sides.
[0019]
[Means for Solving the Problems]
  In order to solve the above-mentioned problems and achieve the purpose,Claim1The coordinate detection device according to the present invention forms a touch panel surface by irradiating light substantially parallel to the writing surface of the whiteboard or the display surface of the display device, and detects a position where the light forming the touch panel surface is shielded. A coordinate detection device for detecting a coordinate position on the writing surface or the display surface, comprising a rectangular shape, and at least two light source means for irradiating light substantially parallel to the writing surface or the display surface A reflecting member that recursively reflects light emitted from the light source means is disposed inside at least three of the four sides of the frame;In the corner portions of the four-side frames constituting the rectangular shape, the long side frames of adjacent frames are shortened without reaching the short side frames, and the short side frames are extended beyond the corner portions, Retroreflective means provided with a gap in the part,At least two light receiving means for receiving reflected light reflected by the retroreflecting means, and among the reflecting members of the retroreflecting means, the reflecting surface of the bottom reflecting member constituting the rectangular shape and the writing surface Alternatively, the angle formed between the reflecting surface and the horizontal plane among the angles obtained by dividing the angle formed between the reflecting surface of the reflecting member on the bottom and the writing surface or the display surface by a horizontal plane is an obtuse angle with the display surface. The angle is an acute angle.
[0020]
  This claim1In the coordinate detecting apparatus, the angle formed between the reflecting surface of the bottom reflecting member and the writing surface or the display surface constituting the rectangular shape is an obtuse angle, and the reflecting surface of the bottom reflecting member and the writing surface or the display surface are The angle formed by the reflecting surface and the horizontal surface is an acute angle, and when dust falls on the reflecting surface of the reflecting member at the bottom, the dust is reflected on the reflecting surface. Slide down along.Further, it is difficult to clean, and there is a gap in the corner portion where dust or the like is likely to be collected. Further, reflection is performed by the reflecting surface of the reflecting member having the larger light incident angle at the corner portion where the light incident angle from the light source means is the smallest and the reflection performance is the lowest. In other words, the light traveling toward the portion having the lowest reflection performance is reflected by the reflection member having the higher reflection performance.
[0021]
  Claims2The coordinate detection device according to the present invention forms a touch panel surface by irradiating light substantially parallel to the writing surface of the whiteboard or the display surface of the display device, and detects a position where the light forming the touch panel surface is shielded. A coordinate detection device for detecting a coordinate position on the writing surface or the display surface, comprising a rectangular shape, and at least two light source means for irradiating light substantially parallel to the writing surface or the display surface A reflecting member that recursively reflects light emitted from the light source means is disposed inside at least three of the four sides of the frame;In the corner portions of the four-side frames constituting the rectangular shape, the long side frames of adjacent frames are shortened without reaching the short side frames, and the short side frames are extended beyond the corner portions, Retroreflective means provided with a gap in the part,At least two light receiving means for receiving reflected light reflected by the retroreflecting means, and among the reflecting members of the retroreflecting means, the reflecting surface of the bottom reflecting member constituting the rectangular shape and the writing surface Alternatively, an angle formed with the display surface is an acute angle, and a space portion is provided between the reflection surface of the reflection member on the bottom side and the writing surface or the display surface.
[0022]
  This claim2In the coordinate detection apparatus, the angle formed between the reflecting surface of the bottom reflecting member and the writing surface or display surface constituting the rectangular shape is an acute angle, and the reflecting surface of the bottom reflecting member and the writing surface or display are When dust or the like falls on the reflecting surface of the bottom reflecting member, the dust or the like slides down to the space along the reflecting surface.Further, it is difficult to clean, and there is a gap in the corner portion where dust or the like is likely to be collected. Further, reflection is performed by the reflecting surface of the reflecting member having the larger light incident angle at the corner portion where the light incident angle from the light source means is the smallest and the reflection performance is the lowest. In other words, the light traveling toward the portion having the lowest reflection performance is reflected by the reflection member having the higher reflection performance.
[0023]
  Claims3The coordinate detection apparatus according to claim1 or 2The coordinate detection apparatus described above is further characterized by further comprising an angle adjusting means capable of adjusting an angle formed between the writing surface or the display surface and the reflecting surface of the reflecting member.
[0024]
  This claim3In the coordinate detection apparatus, the angle adjustment means adjusts the angle formed between the writing surface or the display surface and the reflecting surface of the reflecting member, whereby the whiteboard writing surface or the display surface of the display device and the retroreflecting means are adjusted. It is possible to make the angle formed with the reflective surface at an angle such that dust or the like does not collect or an angle at which cleaning can be easily performed.
[0025]
  Claims4The coordinate detection apparatus according to claim1-3It is a coordinate detection apparatus as described in any one of these, Comprising: The said reflection member is provided so that attachment or detachment is possible.
[0026]
  This claim4In the coordinate detection apparatus, the reflection member is detachably provided, and the reflection member can be removed from the coordinate detection apparatus, cleaned, and attached again after cleaning.
[0045]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a coordinate detection apparatus of the present invention will be described in detail below in the order of Embodiments 1 to 9 with reference to the accompanying drawings.
[0046]
Embodiment 1 FIG.
The coordinate detection apparatus of Embodiment 1 includes a reflection member that reflects incident light in a direction opposite to the incident direction (retroreflection), and the reflection surface of the reflection member is relative to the writing surface of the coordinate input whiteboard. Among the angles obtained by dividing the angle formed by the reflecting surface and the writing surface by the horizontal plane, the angle formed by the reflecting surface and the horizontal plane is provided as an acute angle.
[0047]
In the first embodiment, a method of irradiating fan light from a light source is described as an example. However, the light scanning method described as a conventional technique may be used. A display device may be used instead of the white board.
[0048]
FIG. 1 is a schematic configuration diagram of a coordinate detection device according to Embodiment 1 of the present invention. The coordinate detection device of Embodiment 1 includes a whiteboard 101 that is a coordinate input area and both ends of an upper portion of the whiteboard 101. Optical units 102A and 102B, which form a touch panel surface by irradiating fan light in parallel with the writing surface of the whiteboard 101, and arranged on the left and right and lower sides of the panel, from the optical units 102A and 102B. Reflecting members 103A, 103B, and 103C that retroreflect light, a calculation unit 104 that calculates coordinates (X1, Y1) indicated by the marker pen 107, and the coordinates (X1, Y1) calculated by the calculation unit 104 And an interface unit 105 for outputting to an external personal computer (PC) 106 or the like.
[0049]
The optical units 102A and 102B irradiate the reflection members 103A, 103B, and 103C with fan light. The irradiated light is retroreflected by the reflecting members 103A, 103B or 103C and received by the optical units 102A and 102B. When writing is performed with the marker pen 107 or the like, in other words, when the light from the optical units 102A and 102B is blocked by the marker pen 107 or the like, the light of the blocked portion does not reach the reflecting members 103A to 103C, and accordingly Since no retroreflection is performed, the optical units 102A and 102B are not reached and no light is received.
[0050]
The optical units 102A and 102B detect angles θ1 and θ2 between a line connecting positions corresponding to the respective light sources on a coordinate plane overlapping the touch panel surface and a direction not receiving light, and information indicating the angles θ1 and θ2 is calculated by the calculation unit 104. Output to.
[0051]
On the coordinate plane, the distance between the positions corresponding to the light sources of the optical units 102A and 102B is W1, the position corresponding to the light source of the optical unit 102A is the origin, and the x axis is taken in the direction from the optical unit 102A to the optical unit 102B. If the y-axis is taken in the direction toward the whiteboard 101, the coordinates (X1, Y1) indicated by the marker pen 107 and the like can be derived from the following equation.
X1 = W1 · tan θ2 / (tan θ1 + tan θ2)
Y1 = W1 · tan θ1 · tan θ2 / (tan θ1 + tan θ2)
[0052]
The calculation unit 104 acquires the values of θ1 and θ2 from the optical units 102A and 102B, and is indicated by the marker pen 107 or the like using W1 that is measured and input in advance, the acquired θ1 and θ2, and the above-described formula. The coordinates (X1, Y1) are calculated, and the coordinates (X1, Y1) are output to the personal computer 106 or the like via the interface unit 105. For example, when a line is drawn on the whiteboard 101 with the marker pen 107 or the like, a change in time and a position with respect to time are detected. By processing these pieces of information with the personal computer 106, a drawn image can be captured.
[0053]
FIG. 2 is a schematic configuration diagram of the optical unit 102A according to the first embodiment. (A) is a front view, (b) is a side view. The optical unit 102A includes a laser diode (LD) 201 as a light source, a cylindrical lens that changes only the magnification in one direction of the image, or a toroidal lens that changes only the magnification in one direction of the image and has no change in magnification depending on the incident angle. The optical lens 202 used, the diffusion lens 203 that diffuses the light irradiated from the LD 201 in a fan shape, and the light from the diffusion lens 203 is irradiated toward the reflecting members 103B and 103C, and retroreflected by the reflecting members 103B and 103C. A half mirror 204 that transmits the reflected light, a condensing lens 205 that collects the light transmitted through the half mirror 204, and a light receiving unit 206 that detects a direction in which the reflected light does not return.
[0054]
Here, the LD 201 may emit visible light, but the one that emits infrared light is used. The optical unit 102B has the same configuration.
[0055]
The light emitted from the LD 201 passes through the optical lens 202 and the diffusion lens 203 and is reflected by the half mirror 204. The reflected light exits the optical unit 102A and travels parallel to the writing surface of the whiteboard 101 while spreading in a fan shape. When there is nothing to block on the touch panel surface, the reflection members 103B and 103C are retroreflected, the reflected light returns to the optical unit 102A, passes through the half mirror 204 and the condenser lens 205, and is received by the light receiving unit 206. On the other hand, when there is something that blocks light on the touch panel surface, the light from the optical unit 102A is blocked by the shielding object, so that part of the light does not reach the reflecting members 103B and 103C, and thus the light receiving unit 206 is Does not receive some reflected light.
[0056]
Next, a method for obtaining the direction touched by the marker pen 107 or the like, in other words, θ1 that is the direction in which the light is blocked by the marker pen 107 or the like will be described. FIG. 3 is an explanatory diagram of the angle detection method according to the first embodiment.
[0057]
On the coordinate plane, the point corresponding to the center position of the light source is set as the light source point 301, and the intersection of the light receiving unit 206 with the straight line connecting the position indicated by the marker pen 107 and the light source point 301, in other words, the center of the shadow by the marker pen 107 A point is a shadow center point 302, a perpendicular line dropped from the light source point 301 to the light receiving unit 206 is a perpendicular line 303, and an intersection of the perpendicular line 303 and the light receiving unit 206 is a light reception center point 304.
[0058]
Further, the position of the shadow center point 302 with respect to the light receiving center point 304 on the light receiving unit 206 with the right direction being minus and the left direction being plus is a. Assume that the angle formed between the line 303 connecting the position indicated by the marker pen 107 and the light source point 301 and the vertical line 303 is α1, the angle formed between the vertical line 303 and the x axis is β1, and the distance between the light source point and the light receiving unit 206 is t. By measuring t and β1 in advance, by detecting the position of the shadow on the light receiving unit 206 and obtaining a, θ1 can be derived using the following equation. Note that θ2 can be similarly derived.
tan α1 = a / t
θ1 = β1-α1
[0059]
Next, with reference to FIG. 4 and FIG. 5, the reflecting member 103B, which is the main part of the present invention, will be described. FIG. 4 is a schematic cross-sectional view illustrating the configuration of the reflecting member 103B of the first embodiment. The whiteboard 101 is attached to a base 401 that is a base of the coordinate detection device by a fastening portion (not shown). The reflection member 103B is attached to a support member 402 that supports the reflection member. Further, a cover 403 that prevents unnecessary extraneous light and serves as a dust receiver is provided around the reflecting member 103B.
[0060]
The support member 402 has a trapezoidal cross section so that the reflection surface of the reflection member 103B forms an obtuse angle δ1 with respect to the writing surface of the whiteboard 101, and the reflection surface of the reflection member 103B and the whiteboard Of the angles obtained by dividing the angle formed by the writing surface 101 with the horizontal plane, the angle δ2 formed by the horizontal plane and the reflective surface is provided as an acute angle. Spaces t1 and t2 are provided between the whiteboard 101 and the reflecting member 103B and between the portion of the cover 403 that prevents extraneous light and the reflecting member 103B, respectively. The space part may be only t2.
[0061]
FIGS. 5A and 5B are schematic views of corner cube reflectors used in the reflecting members 103A, 103B, and 103C of the first embodiment. The reflecting members 103A, 103B, and 103C are configured by, for example, a corner cube array in which many corner cube reflectors 501 or 502 are arranged, or an inexpensive retroreflective tape. The reflecting surfaces of the reflecting members 103A, 103B, and 103C have a rectangular shape. The optical units 102A and 102B correspond to the light source means and the light receiving means of the present invention.
[0062]
In the above configuration, for example, when dust, dust, or dust 404 falls on the reflecting member 103B, the dust 404 moves along the slope of the reflecting member 103B, falls from the space t2, and is collected in the cover 403. . The marker pens that have fallen off the whiteboard 101 fall through the space t1 and are collected on the cover 403. The cover 403 can be removed, and collected dust 404 can be cleaned.
[0063]
As described above, according to the first embodiment, the reflection surface of the reflection member 103B has an angle δ1 that is an obtuse angle with respect to the writing surface of the whiteboard 101, and when this angle is divided by a horizontal plane, the reflection plane and the horizontal plane Since the angle between the reflection member 103B and the light blocking the light to the reflection member 103B slides down along the slope of the reflection surface, it is difficult for the dust to collect on the reflection surface of the reflection member 103B. In addition, the user's burden of cleaning can be reduced.
[0064]
In addition, since there are spaces t1 and t2 between the reflecting member 103B and the whiteboard 101 and between the reflecting member 103B and the cover 403, which are portions where the dust 404 easily falls, the dust 404 that falls on the reflecting member 103B is removed. Can be reduced.
[0065]
Embodiment 2. FIG.
The coordinate detection apparatus according to the second embodiment has basically the same configuration as the coordinate detection apparatus according to the first embodiment, and only the angles of the reflection surfaces of the support member and the reflection member 103B are different. The description will be omitted with reference numerals, and only different parts will be described. FIG. 6 is a schematic cross-sectional view illustrating the configuration of the reflecting member 103B according to the second embodiment. The support member 601 of the second embodiment supports the reflection surface of the reflection member 103B so that the reflection surface has an angle δ3 that is an acute angle with respect to the writing surface of the whiteboard 101.
[0066]
In the above configuration, the operation of the second embodiment will be described. The dust 404 that has fallen on the reflecting member 103B moves along the reflecting surface of the reflecting member 103B and falls from the space t1 to the cover 403. On the other hand, the dust 404 that has directly dropped into the spaces t1 and t2 is directly stored on the cover 403.
[0067]
As described above, according to the second embodiment, the reflecting member 103B has an acute angle δ3 with respect to the writing surface of the whiteboard 101, and dust or the like that blocks light to the reflecting member 103B follows the slope of the reflecting surface. Therefore, it is difficult for dust to collect on the reflecting surface of the reflecting member 103B, and it is possible to reduce the frequency of malfunction, interruption of work, and the burden of cleaning for the user.
[0068]
In addition, since there are spaces t1 and t2 between the reflecting member 103B and the whiteboard 101 and between the reflecting member 103B and the cover 403, which are portions where the dust 404 easily falls, the dust 404 that falls on the reflecting member 103B is removed. Can be reduced.
[0069]
Embodiment 3 FIG.
The coordinate detection device of the third embodiment has basically the same configuration as the coordinate detection device of the first embodiment, and has an angle adjustment function for cleaning. The description of the same parts as those of the coordinate detection apparatus of the first embodiment will be omitted, and only different parts will be described. FIG. 7 is a schematic side view illustrating the configuration of the reflecting member 103B according to the third embodiment.
[0070]
A rotatable pin 702 is attached to the lower side of the base 401 at both ends of the support member 701 of the third embodiment by a method such as press fitting, and is rotatably supported by a side plate 703 fixed to the base 401. Pins 704 are attached to both ends of support member 701 or on the opposite side of one base by a method such as press fitting, and pins 705 are attached to side plate 703. A spring 706 is placed between the pin 704 and the pin 705, and the support member 701 is attracted to the base 401 side and pressed and held. The pins 702, 704 and 705, the spring 706 and the side plate 703 correspond to the angle adjusting means of the present invention.
[0071]
In the above configuration, for example, when the dust 404 falls from the whiteboard 101 onto the reflecting surface of the reflecting member 103B, the dust 404 slides along the reflecting surface of the reflecting member 103B. Even when dust 404 remains on the reflection surface, the user pulls the upper part of the support member 701 downward on the opposite side of the base 401, so that the support member 701 rotates about ¼ around the pin 702, and dust or the like swings. Be dropped. Furthermore, since the reflecting member 103B is pressed and held in a state of facing the user, cleaning is easy to perform.
[0072]
As described above, according to the third embodiment, dust 404 is shaken off when the reflecting member 103B is rotated by a quarter of a turn, so that dust on the reflecting surface of the reflecting member 103B can be reduced. Further, since the reflecting member 103B can be directed toward the user, the reflecting surface of the reflecting member 103B can be easily cleaned. In particular, it is possible to easily clean the portion where the reflective surface of the reflective member that is difficult to clean when fixed and the writing surface of the whiteboard are in contact.
[0073]
In the third embodiment, the example in which the reflecting surface of the reflecting member has an obtuse angle with respect to the writing surface of the whiteboard has been described, but the reflecting surface of the reflecting member is white as in the second embodiment. It may have an acute angle with respect to the writing surface of the board and may have a space between the whiteboard and the reflecting surface of the reflecting member is at an angle of 90 degrees with respect to the writing surface of the whiteboard. You may make it have. In addition, the angle of the left and right reflecting members as well as the reflecting members arranged at the bottom of the whiteboard may be adjusted.
[0074]
Embodiment 4 FIG.
The coordinate detection device according to the fourth embodiment has basically the same configuration as the coordinate detection device according to the first embodiment, and the reflection member 103B can be removed. The description of the same parts as those of the coordinate detection apparatus of the first embodiment will be omitted, and only different parts will be described. FIG. 8 is a schematic cross-sectional view illustrating the configuration of the reflecting member 103B according to the fourth embodiment.
[0075]
The reflecting member 103B according to the fourth embodiment is bonded and fixed to a guide plate 801 having claws 802, and has a structure integrated with the guide plate 801. The support member 803 is provided with a recess 804, and the guide plate 801 is fixed to the support member 803 by hooking the claw 802 onto the recess 804. That is, the guide plate 801 is so-called patched to the support member 803.
[0076]
In the above configuration, for example, when the user pulls the guide plate 801 integral with the reflection member 103B upward, the claw 802 is detached from the recess 804, and the reflection member 103B and the guide plate 801 are separated from the support member 803. . In other words, the reflecting member 103B is removed from the coordinate detection device. By removing the reflecting member 103B, cleaning can be easily performed.
[0077]
Note that any method may be used to removably fix the reflecting member 103B to the coordinate detection device. For example, as shown in FIG. 9A, a guide plate 901 having a claw 903 at the center and a recess at the center. The support member 902 may be used. Further, as shown in FIG. 9B, a hard coat layer 904 that protects the reflection surface of the reflection member 103B from scratches may be provided on the surface of the reflection member 103B.
[0078]
As described above, according to the fourth embodiment, since the guide plate 801 can be removed by pulling it upward, the reflective surface of the reflective member 103B can be easily cleaned by placing it in a stable place. Can do. Further, when the hard coat layer 904 is provided on the surface of the reflecting member 103B, the reflecting surface of the reflecting member 103B is protected, and it is not necessary to pay special attention when cleaning, and the reflecting member 103B can be easily cleaned. it can.
[0079]
Embodiment 5. FIG.
The coordinate detection device of the fifth embodiment has basically the same configuration as the coordinate detection device of the first embodiment, and only the periphery of the end of the reflection member 103B is different, so the description of the same portion is omitted. Only the different parts will be described. FIG. 10 is an explanatory diagram for explaining the reflection around the end of the reflecting member 103B according to the fifth embodiment.
[0080]
In the coordinate plane, the intersection of the extension lines of the reflecting surfaces of the adjacent reflecting members 103B and 103A is defined as an intersection 1001, and a point corresponding to the light source of the optical unit 102B that is an optical unit far from the intersection 1001 and the intersection 1001 A straight line connecting the two lines is defined as a straight line 1002. Assume that the angle between the straight line 1002 and the reflecting surface of the reflecting member 103A is θA, the angle between the straight line 1002 and the reflecting surface of the reflecting member 103B is θB, and θA is larger than θB. The end surface of the reflecting member 103B, which is the side with the small angle made with the straight line 1002, is provided in front of the intersection point 1001, and the end surface of the reflecting member 103A with the large angle with the straight line 1002 is provided before the intersecting point 1001. As a result, a gap t3 is created between the reflecting member 103A and the reflecting member 103B.
[0081]
That is, the reflecting member 103B disposed at the long side position of the writing surface of the rectangular whiteboard 101 is shortened without reaching the other reflecting member, and the corner portion of the reflecting member 103A disposed at the short side position is shortened. The gap t3 is provided in the corner portion by extending beyond the corner.
[0082]
With the above configuration, the operation of the fifth embodiment will be described. Assuming that a straight line connecting the end point of the reflecting member 103B and the point corresponding to the light source of the optical unit 102B on the coordinate plane is a straight line 1003, the light between the straight line 1002 and the straight line 1003 is retroreflected by the reflecting member 103A. The light between the straight line 1002 and the straight line 1003 is retroreflected by the reflecting member 103B, assuming that the reflecting member 103B is at the intersection 1001. In other words, the light traveling toward the vicinity of adjacent portions of the two reflecting members is reflected by the reflecting member having the larger incident angle.
[0083]
The reflection member has a higher reflection performance as the incident angle of light is larger, in other words, as the incident angle is closer to 90 degrees, and as the incident angle is smaller, in other words, as the incident angle is farther from 90 degrees, the reflection performance is higher. Lower. The corner portion where the two reflecting members are adjacent is the portion where the incident angle of light from the optical unit is the smallest and the retroreflection performance is the lowest. The light emitted from the optical unit and directed to this portion is retroreflected by the reflecting member having a larger incident angle. That is, the light emitted from the optical unit and directed to the corner portion where the retroreflective performance is the lowest is reflected by the reflective member having the higher reflective performance. The corner portions of the reflecting members 103B and 103C have the same configuration and operation.
[0084]
As described above, according to the fifth embodiment, the light emitted from the optical unit and directed to the corner portion having the lowest retroreflection performance is reflected by the reflecting member having the higher reflection performance. The light reflection performance can be improved. In addition, since the reflecting members are not bonded to each other, the reflection performance is not deteriorated due to bonding variation.
[0085]
Furthermore, when the reflecting members are joined together, dust or the like is likely to accumulate, and there is a gap t3 at the corners of the reflecting members that are difficult to clean. Easy to clean.
[0086]
In the fifth embodiment, θA is larger than θB. However, in the opposite case, in other words, in the case of a vertically long whiteboard, the end surface of 103A is provided in front of the intersection point 1001, and the end surface of 103B is disposed at the intersection point. Provided before 1001. When θA and θB are equal, in other words, in the case of a square whiteboard, the reflecting member 103B positioned on the lower side is shortened. As a result, a downward gap is formed, and dust or the like is easily dropped.
[0087]
Embodiment 6 FIG.
The coordinate detection device according to the sixth embodiment has basically the same configuration as the coordinate detection device according to the first embodiment, and is provided with a reflecting member on a column that is rotatable. Description of the same parts as those of the coordinate detection apparatus of the first embodiment will be omitted, and only different parts will be described. FIG. 11 is a schematic cross-sectional view illustrating the configuration of the reflecting member according to the sixth embodiment.
[0088]
The reflecting member 1101 arranged at the lower side position of the whiteboard 101 of the sixth embodiment is bonded and fixed to the surface of the support member 1102 having a cylindrical shape. The support member 1102 is rotatably held by a side plate (not shown). A brush 1104 is provided between the base 1103 and the reflecting member 1101.
[0089]
With the above configuration, the operation of the sixth embodiment will be described. The reflection member 1101 is rotated halfway by a motor (not shown) or manually, and the surface that has been retroreflected up to that point faces downward, and the surface that has faced the lower side faces upward and performs retroreflection. Dust and the like adhering to the surface facing upward falls when the surface faces downward. Further, dust adhering to the surface facing downward due to static electricity or the like is swept away by the brush 1104.
[0090]
As described above, according to the sixth embodiment, since the reflecting member 1101 rotates halfway and dust falls from the surface facing downward, it is difficult to collect dust that blocks light to the reflecting member and malfunctions. Occurrence frequency, work interruption, and user cleaning burden can be reduced. Furthermore, since dust etc. are swept off by the brush 1104, the reflective surface of the reflective member can be easily cleaned.
[0091]
Embodiment 7 FIG.
The coordinate detection device according to the seventh embodiment has basically the same configuration as the coordinate detection device according to the sixth embodiment, and the reflecting member is composed of an endless belt and is rotatably provided by a rotating roller. The description of the same parts as those of the coordinate detection apparatus of the sixth embodiment is omitted, and only different parts will be described. FIG. 12 is a schematic cross-sectional view illustrating the configuration of the reflecting member according to the seventh embodiment.
[0092]
The reflective member 1101 disposed at the lower side of the whiteboard 101 according to the seventh embodiment is composed of an endless belt connected at both ends, and is rotatably held by a roller 1202. The roller 1202 is rotatably held by a side plate (not shown). A brush 1104 is provided between the base 1103 and the reflecting member 1201.
[0093]
With the above configuration, the operation of the seventh embodiment will be described. The reflection member 1201 is rotated by a motor (not shown) or manually, and the surface that has been retroreflected up to that point faces downward, and the hidden surface appears and performs retroreflection. Dust and the like adhering to the surface facing upward falls when the surface faces downward. Further, dust adhering to the surface facing downward due to static electricity or the like is swept away by the brush 1104.
[0094]
As described above, according to the seventh embodiment, since the reflecting member 1201 made of an endless belt connected at both ends rotates and dust falls from the downward surface, dust etc. that blocks light to the reflecting member is removed. It is possible to reduce the frequency of malfunctions, work interruptions, and user cleaning burdens by making it difficult to collect. Furthermore, since dust etc. are swept off by the brush 1104, the reflective surface of the reflective member can be easily cleaned.
[0095]
Embodiment 8 FIG.
The coordinate detection device according to the eighth embodiment has basically the same configuration as the coordinate detection device according to the seventh embodiment, and only the rotation direction of the reflecting member is different. The description of the same parts as those of the coordinate detection apparatus of the seventh embodiment will be omitted, and only different parts will be described. FIG. 13 is a schematic front view of the coordinate detection apparatus according to the eighth embodiment.
[0096]
The reflecting member 1301 disposed at the lower side of the whiteboard 101 according to the eighth embodiment has a band shape with both ends connected, and the whiteboard 101 is written by a roller 1302 having an axis perpendicular to the whiteboard 101. It is held so as to be rotatable in a horizontal direction with respect to the surface. The roller 1302 is rotatably held on a base (not shown). Further, a brush 1303 is attached to a base (not shown) so as to contact the reflecting member 1301.
[0097]
With the above configuration, the operation of the eighth embodiment will be described. The reflection member 1302 is rotated halfway by a motor (not shown) or manually, and the surface that has been retroreflected until then is directed downward, and the surface that has been directed downward is directed upward to perform retroreflection. Garbage and the like adhering to the surface facing upward falls when the surface faces downward. Further, dust adhering to the surface facing downward due to static electricity or the like is swept away by the brush 1303.
[0098]
As described above, according to the eighth embodiment, since the reflecting member 1301 rotates halfway and dust falls from the downward surface, it is difficult to collect dust that blocks light to the reflecting member and malfunctions. Occurrence frequency, work interruption, and user cleaning burden can be reduced. Further, since dust and the like are removed by the brush 1303, the reflecting surface of the reflecting member can be easily cleaned.
[0099]
Embodiment 9 FIG.
The coordinate detection device according to the ninth embodiment has basically the same configuration as the coordinate detection device according to the sixth embodiment, and the reflection member has a plate shape and is provided so as to be able to be reversed. The description of the same parts as those of the coordinate detection apparatus of the sixth embodiment is omitted, and only different parts will be described. FIGS. 14A and 14B are a schematic cross-sectional view and a schematic front view of the coordinate detection device for explaining the configuration of the reflecting member according to the ninth embodiment.
[0100]
The reflecting member 1401 disposed at the lower side position of the whiteboard 101 according to the ninth embodiment is bonded and fixed to both surfaces of the plate-like supporting member 1402, and the supporting member 1402 is attached to the writing surface of the whiteboard 101. It is attached to a side plate (not shown) so that it can rotate in the vertical direction. A brush 1403 is installed below the reflecting member 1401 so as to be movable in the horizontal direction with respect to the panel.
[0101]
With the above configuration, the operation of the ninth embodiment will be described. The reflection member 1401 is rotated halfway by a motor (not shown) or manually, and the surface that has been retroreflected so far is directed downward, and the surface that has been directed downward is directed upward to perform retroreflection. Garbage and the like adhering to the surface facing upward falls when the surface faces downward. Further, dust adhered to the surface facing downward due to static electricity or the like is swept away by the brush 1403. When the reflecting member 1401 rotates, the brush 1403 is stored in a home position 1403A that is a position that does not hinder the rotation.
[0102]
Further, a gear mechanism (angle adjusting means) that can fix the support member 1402 and the reflection member 1401 at an arbitrary angle may be provided. In this case, by fixing the reflecting surface of the reflecting member 1401 to an angle other than perpendicular to the direction of gravity, in other words, an angle having an inclination with respect to the ground, dust or the like on the reflecting surface of the reflecting member 1401 can be removed. It slides down along the reflective surface.
[0103]
As described above, according to the ninth embodiment, the reflecting member 1301 is rotated halfway and the dust falls from the downward surface, so that the dust blocking the light to the reflecting member is less likely to be collected and malfunctions. Occurrence frequency, work interruption, and user cleaning burden can be reduced. Furthermore, since dust etc. are swept off by the brush 1403, the reflective surface of the reflective member can be easily cleaned.
[0104]
Further, in the case where a gear mechanism (angle adjusting means) that can fix the support member 1402 and the reflection member 1401 at an arbitrary angle is provided, the reflection surface of the reflection member 1401 has an angle other than perpendicular to the direction of gravity. For example, by fixing at an angle with respect to the ground, dust etc. on the reflecting surface of the reflecting member 1401 slides down along the reflecting surface. It is possible to reduce the frequency of malfunctions, the interruption of work, and the burden of user cleaning.
[0105]
As shown in FIG. 15, the same effect can be obtained by using a triangular prism-shaped support member 1502 instead of the plate-shaped support member 1402 and bonding and fixing the reflecting member 1501 to the surface thereof.
[0108]
【The invention's effect】
  As described above, the coordinate detection device of the present invention (Claim 1)The angle formed between the reflecting surface of the bottom reflecting member and the writing surface or the display surface constituting the rectangular shape is an obtuse angle, and the angle formed between the reflecting surface of the bottom reflecting member and the writing surface or the display surface is divided by a horizontal plane. Of the corners, the angle between the reflecting surface and the horizontal surface is an acute angle. When dust falls on the reflecting surface of the bottom reflecting member, the dust slides along the reflecting surface. It is possible to reduce accumulation of dust, dust, or dust on the reflecting surface, thereby reducing the frequency of malfunctions, interruption of work, and the burden of user cleaning.Further, since there is a gap in the corner portion where it is difficult to clean and where dust or the like easily collects, dust or the like does not collect in the corner portion and cleaning is easy. Furthermore, reflection is performed by the reflecting surface of the reflecting member having the larger incident angle of light at the corner portion of the reflecting member on the two sides, which is the portion having the smallest incident angle of light from the light source means and the lowest reflecting performance. Is called. In other words, since the light traveling toward the corner portion is reflected by the reflecting member having higher reflection performance, the light reflection performance at the corner portions of the reflecting members on the two sides can be enhanced.
[0109]
  Further, the coordinate detection apparatus of the present invention (claims)2) Is an acute angle between the reflecting surface of the bottom reflecting member and the writing surface or display surface constituting the rectangular shape, and there is a space between the reflecting surface of the bottom reflecting member and the writing surface or display surface. When dust falls on the reflecting surface of the bottom reflective member, the dust slides into the space along the reflective surface, so that dust, dust, or dust accumulates on the reflective surface of the reflective member. This makes it possible to reduce the frequency of malfunctions, work interruptions, and user cleaning burdens.Further, since there is a gap in the corner portion where it is difficult to clean and where dust or the like easily collects, dust or the like does not collect in the corner portion and cleaning is easy. Furthermore, reflection is performed by the reflecting surface of the reflecting member having the larger incident angle of light at the corner portion of the reflecting member on the two sides, which is the portion having the smallest incident angle of light from the light source means and the lowest reflecting performance. Is called. In other words, since the light traveling toward the corner portion is reflected by the reflecting member having higher reflection performance, the light reflection performance at the corner portions of the reflecting members on the two sides can be enhanced.
[0110]
  Further, the coordinate detection apparatus of the present invention (claims)3) Is formed between the writing surface of the whiteboard or the display surface of the display device and the reflecting surface of the retroreflective means by adjusting the angle between the writing surface or display surface and the reflecting surface of the reflecting member by the angle adjusting means. The angle can be set so that dust does not collect or can be easily cleaned, so that it does not collect dust, dust or dirt on the reflective surface of the reflective member, causing malfunction. Occurrence frequency, work interruption and user's burden of cleaning can be reduced, and the reflective surface of the reflective member can be easily cleaned.
[0111]
  Further, the coordinate detection apparatus of the present invention (claims)4), The reflective member is detachably provided, and the reflective member can be removed from the coordinate detection device, cleaned, and attached again after cleaning, so that the reflective surface of the reflective member can be easily cleaned. .
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a coordinate detection apparatus according to a first embodiment of the present invention.
2 is a schematic configuration diagram of an optical unit according to Embodiment 1. FIG.
3 is an explanatory diagram of an angle detection method according to Embodiment 1. FIG.
4 is a schematic cross-sectional view illustrating a configuration of a reflecting member according to Embodiment 1. FIG.
FIG. 5 is a schematic view of a corner cube reflector used in the reflecting member according to the first embodiment.
6 is a schematic cross-sectional view illustrating a configuration of a reflecting member according to Embodiment 2. FIG.
7 is a schematic side view illustrating the configuration of a reflecting member according to Embodiment 3. FIG.
8 is a schematic cross-sectional view illustrating the configuration of a reflecting member according to Embodiment 4. FIG.
FIG. 9 is a schematic cross-sectional view illustrating the configuration of another reflecting member according to the fourth embodiment.
FIG. 10 is an explanatory diagram for explaining reflection around an end portion of a reflecting member according to a fifth embodiment;
11 is a schematic cross-sectional view illustrating the configuration of a reflecting member according to Embodiment 6. FIG.
12 is a schematic cross-sectional view illustrating the configuration of a reflecting member according to Embodiment 7. FIG.
FIG. 13 is a schematic front view of a coordinate detection apparatus according to an eighth embodiment.
FIG. 14 is a schematic cross-sectional view illustrating the configuration of a reflecting member according to a ninth embodiment and a schematic front view of a coordinate detection device.
FIG. 15 is a schematic cross-sectional view illustrating another configuration of the reflecting member according to the ninth embodiment.
FIG. 16 is a schematic configuration diagram of a conventional coordinate detection apparatus.
[Explanation of symbols]
101 whiteboard
102A, 102B Optical unit
103A, 103B, 103C Reflective member
104 Calculation unit
105 Interface section
106 PC
107 pen
201 Laser diode
202 Optical lens
203 Diffuse lens
204 half mirror
205 condenser lens
206 Light receiver
501,502 Corner cube
401, 1103 base
402,601,701,803,902 Support member
403 cover
t1, t2 space
702, 704, 705 pins
703 Side plate
706 Spring
801,901 Guide plate
802,903 nails
804 recess
904 Hard coat
t3 clearance
1101, 1201, 1301, 1401, 1501 Reflective member
1102, 1402, 1502 Support member
1202, 1302 Roller
1104, 1303, 1403 Brush

Claims (4)

By irradiating light substantially parallel to the writing surface of the whiteboard or the display surface of the display device to form a touch panel surface, and detecting the position where the light forming the touch panel surface is shielded, the writing surface or A coordinate detection device for detecting a coordinate position on a display surface,
At least two light source means for irradiating light substantially parallel to the writing surface or the display surface;
A reflection member that recursively reflects light emitted from the light source means is disposed inside at least three of the four-side frames constituting the rectangular shape, and corner portions of the four-side frames constituting the rectangular shape are arranged. In the retroreflective means that shortens the long side frame of the adjacent frames without reaching the short side frame, extends the short side frame beyond the corner portion, and provides a gap portion at the corner portion, and
And at least two light receiving means for receiving the reflected light reflected by the retroreflecting means,
Of the reflecting members of the retroreflective means, the angle formed by the reflecting surface of the bottom reflecting member constituting the rectangular shape and the writing surface or the display surface is an obtuse angle, and the reflecting surface of the reflecting member of the bottom A coordinate detection apparatus characterized in that an angle formed by a reflecting surface and a horizontal plane is an acute angle among angles obtained by dividing the angle formed by the writing surface or the display surface by a horizontal plane. By irradiating light substantially parallel to the writing surface of the whiteboard or the display surface of the display device to form a touch panel surface, and detecting the position where the light forming the touch panel surface is shielded, the writing surface or A coordinate detection device for detecting a coordinate position on a display surface,
At least two light source means for irradiating light substantially parallel to the writing surface or the display surface;
A reflection member that recursively reflects light emitted from the light source means is disposed inside at least three of the four-side frames constituting the rectangular shape, and corner portions of the four-side frames constituting the rectangular shape are arranged. In the retroreflective means that shortens the long side frame of the adjacent frames without reaching the short side frame, extends the short side frame beyond the corner portion, and provides a gap portion at the corner portion, and
And at least two light receiving means for receiving the reflected light reflected by the retroreflecting means,
Of the reflecting members of the retroreflecting means, the angle formed by the reflecting surface of the bottom reflecting member and the writing surface or the display surface constituting the rectangular shape is an acute angle, and the reflecting surface of the reflecting member of the bottom A coordinate detection apparatus having a space portion between the writing surface and the display surface. Further, the coordinate detecting device according to claim 1 or 2, wherein the angle formed between the reflecting surface of the reflecting member and the writing surface, or the display surface with adjustable angle adjusting means. The reflecting member, the coordinate detecting device according to any one of claims 1 to 3, characterized in that are provided detachably.

Images